Zisha set is made of Zisha(purple clay) from the region near the city of Yixing in Jiangsu province, China. Its use dates back to the Song Dynasty (960 - 1279) when Yixing clay was first mined around Lake Taihu in China Yixing teawares are prized because their unglazed surfaces absorb traces of the beverage, creating a more complex flavour. For these reasons, yixing teawares should never be washed using detergents, but rather with water only, and connoisseurs recommend using each tea vessel for one kind of tea (white, green, oolong, or black) or sometimes even one variety of tea only. According process way, there are two kinds of Zisha tea ware, one is made by hand completely and the other is made by machine and by hand. Usually, one set of Zisha teaset include 1 tea pot, 1 tea pitcher, 6 or 8cups.